Study of TCP and UDP Flows in a Differentiated Services Network Using Two Markers System*Sung-Hyuck Lee, Seung-Joon Seok, Seung-Jin Lee, and Chul-Hee Kang* Department of Electronics Engineering, Abstract. There are two cruxes of issues identified in differentiated services (diffserv) networks: One is TCP dynamics over Assured Services, and the other is the interaction of TCP and UDP flows for Assured Forwarding Per Hop Behavior (PHB). Therefore, we argue unfair distribution of excess bandwidth in an over-provisioned networks as well as unfair degradation in an under-provisioned network for TCP and UDP flows traffic. First, we consider Two Markers System (TMS) that we have proposed, which is able to properly mark packets and fairly share the bandwidth to each flow for their targeted sending rates. Next, we present simulation results to illustrate the effectiveness of TMS scheme over TCP and UDP interaction. That is, flows in Two Markers System somewhat fairly share the excess bandwidth and experience degradation in proportion to their target rates.
*This
research was supported in part by Information and Telecommunication Research Center (ITRC) contracts.
We are grateful to Asian Pacific Advanced Network-Korea Consortium(APAN-KR) members for technical
discussion on Diffserv related issues. LNCS 2216, p. 198 ff. Online publication: October 10, 2001 |